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AND One TL REV
OR Both TL REV
Single-Engine-Takeoff,
Idle Thrust on one engine,
T/O Thrust on the other engine
AND One TL Idle
AND One TL T/O
Rejected Take-off,
Ground Spoilers,
Autobrake,
Reverse Thrust on one Engine,
Idle on other engine
OR AND One TL REV
AND One TL Idle
OR Both TL REV
Rejected Take-off,
No Ground Spoilers,
No Autobrake,
No Reverse Thrust,
Ground Idle on both engines
Both TL IDLE
AND One TL Idle
AND One TL T/O
Rejected Take-off,
Ground Spoilers,
Autobrake,
No Reverse Thrust,
Ground Idle on both engines
Both TL IDLE
OR AND One TL REV
AND One TL Idle
OR Both TL REV
No Ground Spoilers,
No Autobrake,
Reverse Thrust on one Engine,
T/O Thrust on other engine
AND One TL REV
AND One TL T/O
Boeing B777: Fuel System
The first diagram is the Causal Control Flow Diagram (CCFD) for the Electronic Engine
Control (EEC) of the Boeing B777.
A CCFD is like a functional block diagram, except for three points:

Signal magnitudes are omitted (we have used signs +/- indicating monotoneincreasing
and monotone-decreasing influence where necessary, but it is not necessary
on this);

Equipment duplication (usually there to provide redundant pathways) may be
omitted, and in this case is (only one instance of each device is shown);

It will include the human operator as a control-system component if heshe is one
It shows the signal paths between all the various devices.
The following diagrams show fuel flow. The fuel flow diagrams includes the normal
fuel flow to engines, as well as the cross-feed system, the scavenge system, the water
scavenge system and the jettison system.
The diagram has been split; the first partial graph contains the tanks and the tanks
pumps, scavenge and jettison system, the second partial graph details fuel flow inside
the engine nacelles.
To keep the size to a minimum and in the interest of clarity the graph contains the
following simplifications:

The APU is not shown in detail

Multiple fuel spray nozzles are represented by a single node

Multiple spill valves and fuel bleed lines are represented by a single node

All 4 crossfeed valves (two on each side) are represented by a single node
Some details in the fuel flow graph are unverified and may be inaccurate. These
include:

Position of the spill valves

Fuel bleed return flow

Position of the (low pressure) Fuel filter
The Causal Control-Flow Diagram
Fuel Flow: Tanks, Crossfeed System, Scavenge Systems, Jettison System
Fuel Flow: Engine
THE RISE AND RISE OF AIRBUS, 1970-2005
Isaac Cohen, San Jose State University
Case Objectives and Use
The case is intended to teach students strategy formulation and implementation. Owing to its
scale, visibility and complexity, the aircraft manufacturing industry is well suited for teaching
strategic choices. Students should realize that strategic choices in aircraft manufacturing are
based on a 20-year long forecast, that any new aircraft project is a gamble, and that Boeing’s past
problems were rooted in the company’s inability to sustain cost leadership as well as
technological leadership. An additional objective of the case is to have students evaluate
Airbus’s growth strategy both in the short run and the long run. The division between the
industry two product segments – commercial aircraft /defense and space – highlights the
importance of product differentiation and sharpens the focus of the case.
Case Synopsis
In 2003-2004, for the first time in the history of commercial aircraft manufacturing, Airbus
delivered a larger number of planes than Boeing, and since 2000 Airbus managed to obtain a
larger number of aircraft orders than Boeing.
The case looks at Airbus’s competitive position relative to Boeing, first in the commercial
aircraft industry, and second, in the military aircraft industry where EADS – Airbus’s parent
company – has become a formidable rival to Boeing and other defense contractors. In analyzing
Airbus’s competitive advantage, the case distinguishes between four strategic elements:
technological leadership, cost control, product development, and families of planes. The case
moves on to explore the challenges Airbus faces today (2005), and its vulnerability to a likely
Boeing comeback. All in all, the case provides an analytical and thorough examination of
Airbus’s performance from the day it sold its first plane until June 2005.
The author developed the case for class discussion rather than to illustrate either effective or ineffective handling of
　
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